There's a word for that?
Esprit de l'escalier: Thinking of a witty remark too late; hindsight wit or afterwit.
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Neil Finn's song "Spirit of the Stairs" is about exactly that... (One of the greatest singer songwriters of all time.)
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Spirit of the staircase, as you walk away you think of retort but when you tell the anecdote later, U said it 2 their face


